nk497 writes: "Amazon has unveiled a new digital textbook rental service, allowing students to choose how long they'd like access to an eBook-version of a textbook via their Kindle or app — with the retailer claiming savings as high as 80%. Kindle Textbook Rental will let students use a text for between 30 to 360 days, adding extra days as they need to. Any notes or highlighted text will be saved via the Amazon Cloud for students to reference after the book is "returned". Amazon said tens of thousands of books would be available to rent for the next school year."